Prepare Release v2.6.0

[prudhvigodithi]

Description

Prepare of Release v2.6.0

Issues Resolved

https://github.com/opensearch-project/opensearch-k8s-operator/issues/776

Check List

• [x] Commits are signed per the DCO using --signoff
• [ ] Unittest added for the new/changed functionality and all unit tests are successful
• [ ] Customer-visible features documented
• [x] No linter warnings (make lint)

If CRDs are changed:

• [x] CRD YAMLs updated (make manifests) and also copied into the helm chart
• [x] Changes to CRDs documented

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[prudhvigodithi]

Hey @swoehrl-mw @salyh @pchmielnik @jochenkressin @dbason can we move forward with the release? Thanks @bbarani